org.springframework.beans.factory.config

Interface BeanPostProcessor

All Known Subinterfaces:

DestructionAwareBeanPostProcessor, InstantiationAwareBeanPostProcessor, MergedBeanDefinitionPostProcessor, SmartInstantiationAwareBeanPostProcessor

All Known Implementing Classes:

AutowiredAnnotationBeanPostProcessor, InitDestroyAnnotationBeanPostProcessor, InstantiationAwareBeanPostProcessorAdapter, RequiredAnnotationBeanPostProcessor

public interface BeanPostProcessor

Factory hook that allows for custom modification of new bean instances, e.g. checking for marker interfaces or wrapping them with proxies.

ApplicationContexts can autodetect BeanPostProcessor beans in their bean definitions and apply them to any beans subsequently created. Plain bean factories allow for programmatic registration of post-processors, applying to all beans created through this factory.

Typically, post-processors that populate beans via marker interfaces or the like will implement postProcessBeforeInitialization(java.lang.Object, java.lang.String), while post-processors that wrap beans with proxies will normally implement postProcessAfterInitialization(java.lang.Object, java.lang.String).

Since:

10.10.2003

Author:

Juergen Hoeller

See Also:

InstantiationAwareBeanPostProcessor, DestructionAwareBeanPostProcessor, ConfigurableBeanFactory.addBeanPostProcessor(org.springframework.beans.factory.config.BeanPostProcessor), BeanFactoryPostProcessor

Method Summary

Methods

Modifier and Type	Method and Description
Object	postProcessAfterInitialization(Object bean, String beanName) Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).
Object	postProcessBeforeInitialization(Object bean, String beanName) Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).

Method Detail

postProcessBeforeInitialization

Object postProcessBeforeInitialization(Object bean,
                                     String beanName)
                                       throws BeansException

Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

Parameters:

bean - the new bean instance

beanName - the name of the bean

Returns:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

Throws:

BeansException - in case of errors

See Also:

InitializingBean.afterPropertiesSet()

postProcessAfterInitialization

Object postProcessAfterInitialization(Object bean,
                                    String beanName)
                                      throws BeansException

Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

In case of a FactoryBean, this callback will be invoked for both the FactoryBean instance and the objects created by the FactoryBean (as of Spring 2.0). The post-processor can decide whether to apply to either the FactoryBean or created objects or both through corresponding bean instanceof FactoryBean checks.

This callback will also be invoked after a short-circuiting triggered by a InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String) method, in contrast to all other BeanPostProcessor callbacks.

Parameters:

bean - the new bean instance

beanName - the name of the bean

Returns:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

Throws:

BeansException - in case of errors

See Also:

InitializingBean.afterPropertiesSet(), FactoryBean